Synthesis and Characterization of Hybrid Organic-Inorganic Gel Matrices ontaining Metal Sulphides Particles Prepared by Gas Phase Reaction J.T. Gonçalves, C.J.R. Silva, V.I.Boev, M.J.M. Gomes “NATO-ASI on Nanostructured and Advanced Materials for Applications in Sensor, Optoelectronic and Photovoltaic Technology”, Sozopol, Bulgária, 6-17 de Setembro de 2004, p.83.